<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        #box {
            width: 200px;
            height: 200px;
            background-color: rebeccapurple;
        }
    </style>
</head>

<body>
    <div id="box"></div>
</body>

<script>
    var box = document.querySelector('#box');

    // box.onclick = function() {
    //     console.log('box.onclick1');
    // }

    // box.onclick = function() {
    //     console.log('box.onclick2');
    // }

    // box.onclick = function() {
    //     console.log('box.onclick3');
    // }

    box.addEventListener('click', function() {
        console.log('box.onclick1');
    }, false);

    box.addEventListener('click', function() {
        console.log('box.onclick2');
    }, false);

    box.addEventListener('click', function() {
        console.log('box.onclick3');
    }, false);
</script>
</html>